Stator

ABSTRACT

In a stator, coils of a plurality of phases are wound around a stator core via an insulator. A guide member is provided on one side of the stator core in the axial direction and guides the terminal line of the coil in the circumferential direction at a position overlapping the coil in the axial direction. The guide member has a notch that penetrates in the axial direction in a shape having a guide portion extending radially inward from the radially outer end portion of the guide member and leads the terminal line to one side in the axial direction. End surfaces in the radial direction of the notch, and a bottom part which is one end surface in the axial direction of the guide member is drawn in the circumferential direction, are connected by the recessed part having a recessed shape.

CROSS REFERENCE TO RELATED APPLICATION

The present application is based on Japanese Patent Application No. 2019-21495 filed on Feb. 8, 2019, the disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a stator.

BACKGROUND

Conventionally, as a stator of a motor, multi phase windings are wound on a stator core via an insulator.

SUMMARY

An object of the present disclosure is to provide the stator that can suppress an increase in the radial direction.

In the stator, coils of multiple phases are wound around a stator core via an insulator. A guide member is provided on one side of the stator core in an axial direction and guides a terminal line of the coil in a circumferential direction at a position overlapping the coil in the axial direction. The guide member has a notch that includes a guide part extending radially inward from an outer end in the radial direction of the guide member, penetrates in the axial direction, and guides the terminal line to one side in the axial direction. End surfaces in the circumferential direction at the inner end in the radial direction of the notch, and one end surface in the axial direction of the guide member along the direction in which the terminal line led to one side in the axial direction of the guide member is drawn in the circumferential direction are connected by the recessed part having a recessed shape.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic configuration diagram of an electric brake system including a motor according to an embodiment;

FIG. 2 is a plan view of a stator showing a state in which a guide member in the embodiment is removed;

FIG. 3 is a perspective view of the stator in the embodiment;

FIG. 4 is an exploded perspective view of the stator in the embodiment;

FIG. 5 is a perspective view of a guide body in the embodiment;

FIG. 6 is a plan view of the guide body in the embodiment;

FIG. 7 is a plan view showing a part of the guide member in the embodiment;

FIG. 8 is a cross-sectional view showing a part of the stator in the embodiment;

FIG. 9 is a plan view showing a part of the stator in the embodiment;

FIG. 10 is a plan view of the stator in the embodiment;

FIG. 11 is a plan view showing a part of the stator in the embodiment;

FIG. 12 is a side view showing a part of the stator in the embodiment;

FIG. 13 is a sectional view showing a part of the guide member in the embodiment;

FIG. 14 is a plan view showing a part of the stator in the embodiment;

FIG. 15 is a cross-sectional view showing a part of the stator in the embodiment;

FIG. 16A to FIG. 16D are cross-sectional views of guides for pulling out guide members in the embodiment;

FIG. 17 is a cross-sectional view of the guide for pulling out a guide member in the embodiment;

FIG. 18 is an explanatory diagram for explaining a manufacturing method for the stator in the embodiment;

FIG. 19 is an explanatory diagram for explaining a manufacturing method for the stator in the embodiment;

FIG. 20 is an explanatory diagram for explaining a manufacturing method for the stator in the embodiment;

FIG. 21 is an explanatory diagram for explaining a manufacturing method for the stator in the embodiment;

FIG. 22 is a sectional view showing a part of the guide member in the embodiment;

FIG. 23 is a cross-sectional view showing a part of the stator in the embodiment;

FIG. 24 is a sectional view showing a part of the guide member in the embodiment; and

FIG. 25 is a cross-sectional view showing a part of a guide member in another example.

DETAILED DESCRIPTION

Hereinafter, an embodiment of a motor including a stator will be described with reference to the drawings. In the drawings, for convenience of explanation, part of the configuration may be shown exaggerated or simplified. In addition, the dimensional ratio of each part may be different from the actual one.

As shown in FIG. 1, a motor 10 is used for an electric brake system. The electric brake system includes a hydro unit 11 that adjusts a hydraulic pressure of a brake fluid, the motor 10 that is connected to the hydro unit 11 and drives the hydro unit 11, and an EDU (ELECTRIC DRIVER UNIT) 12 that controls a drive of the motor 10. In the brake system of the present embodiment, the hydro unit 11 is interposed between the EDU 12 and the motor 10. The motor 10 and the EDU 12 are electrically connected through a through hole 11 b provided in a housing 11 a of the hydro unit 11.

The motor 10 of the present embodiment includes a rotor 20 and a stator 30. As shown in FIG. 1, the rotor 20 has a rotor core 21, magnets (not shown) provided on the rotor core 21, and a rotation shaft 22 provided at the radial center of the rotor core 21. One end in the axial direction of the rotation shaft 22 is directly or indirectly connected to a gear 11 c in the hydro unit 11. As a result, when the rotation shaft 22 is rotationally driven, the gear 11 c in the hydro unit 11 is driven to adjust the hydraulic pressure of the brake fluid.

As shown in FIGS. 2 to 4, the stator 30 includes a stator core 31, an insulator 32 (not shown in FIG. 2) of the stator core 31, and coils 33.

The stator core 31 has a substantially annular portion 31 a and a plurality of teeth 31 b extending radially inward from the annular portion 31 a. In the present embodiment, for example, twelve teeth 31 b are provided. The coils 33 are wound around each of teeth 31 b with the insulator 32 located in therebetween. The coils 33 are wound in, for example, a concentrated manner.

The coils 33 include a first three-phase winding 40 which is electrically connected to a first inverter circuit 12 a provided in the EDU 12, and a second three-phase winding 50 which is electrically connected to a second inverter circuit 12 b provided in the EDU 12. That is, in the present embodiment, first and second inverter circuits 12 a and 12 b constituting two systems (plurality of systems) in EDU 12 are provided, and the first and second inverter circuits 12 a and 12 b are supplied current to each of the three-phase windings 40 and 50.

As shown in FIG. 2, the first three-phase winding 40 has a plurality of three-phase windings 41 a to 41 f to which a three-phase alternating current having a phase difference of 120 degrees is supplied from the first inverter circuit 12 a. The plurality of three-phase windings 41 a to 41 f includes U+phase winding 41 a, U−phase winding 41 b, V+phase winding 41 c, V−phase winding 41 d, W+phase winding 41 e, and W−phase winding 41 f.

As shown in FIG. 2, the second three-phase winding 50 has a plurality of three-phase windings 51 a to 51 f to which a three-phase alternating current having a phase difference of 120 degrees is supplied from the second inverter circuit 12 b. The plurality of three-phase windings 51 a to 51 f include X+phase winding 51 a, X−phase winding 51 b, Y+phase winding 51 c, Y−phase winding 51 d, Z+phase winding 51 e, and Z−phase winding 51 f.

The coils 33 of the present embodiment are wound, for example, in the order of W−phase winding 41 f, V+phase winding 41 c, Y+phase winding 51 c, X−phase winding 51 b, U−phase winding 41 b, W+phase winding 41 e, Z+phase winding 51 e, Y−phase winding 51 d, V−phase winding 41 d, U+phase winding 41 a, X+phase winding 51 a, Z−phase winding 51 f, for each tooth 31 b.

Here, the winding direction of the U+phase winding 41 a wound around the teeth 31 b is opposite to the winding direction of the U−phase winding 41 b wound around the teeth 31 b. The winding direction of the V+phase winding 41 c wound around the teeth 31 b is opposite to the winding direction of the V−phase winding 41 d wound around the teeth 31 b. Further, the winding direction of the W+phase winding 41 e wound around the teeth 31 b is opposite to the winding direction of the W−phase winding 41 f wound around the teeth 31 b. The teeth 31 b around which the U+phase winding 41 a is wound and the teeth 31 b around which the U−phase winding 41 b is wound are provided at positions different from each other by 150 degrees in the circumferential direction. The teeth 31 b around which the V+phase winding 41 c is wound and the teeth 31 b around which the V−phase winding 41 d is wound are provided at positions different by 150 degrees in the circumferential direction. The teeth 31 b around the W+phase winding 41 e is wound and the teeth 31 b around the W−phase winding 41 f is wound are provided at positions different by 150 degrees in the circumferential direction.

The winding direction of the X+phase winding 51 a wound around the teeth 31 b is opposite to the winding direction of the X−phase winding 51 b wound around the teeth 31 b. The winding direction of the Y+phase winding 51 c wound around the teeth 31 b is opposite to the winding direction of the Y−phase winding 51 d wound around the teeth 31 b. Further, the winding direction of the Z+phase winding 51 e wound around the teeth 31 b is opposite to the winding direction of the Z−phase winding 51 f wound around the teeth 31 b. The teeth 31 b around the X+phase winding 51 a is wound and the teeth 31 b around the X−phase winding 51 b is wound are provided at positions different by 150 degrees in the circumferential direction. The teeth 31 b around which the Y+phase winding 51 c is wound and the teeth 31 b around which the Y−phase winding 51 d is wound are provided at positions different by 150 degrees in the circumferential direction. The teeth 31 b around the Z+phase winding 51 e is wound and the teeth 31 b around the Z−phase winding 51 f is wound are provided at positions different by 150 degrees in the circumferential direction.

The U+phase winding 41 a and the U−phase winding 41 b are connected by a jumper wire 41 g. The V+phase winding 41 c and the V−phase winding 41 d are connected by a jumper wire 41 h. The W+phase winding 41 e and the W−phase winding 41 f are connected by a jumper wire 41 j. The X+phase winding 51 a and the X−phase winding 51 b are connected by a jumper wire 51 g. The Y+phase winding 51 c and the Y−phase winding 51 d are connected by a jumper wire 51 h. The Z+phase winding 51 e and the Z−phase winding 51 f are connected by a jumper wire 51 j. The jumper wires 41 g, 41 h, 41 j, 51 g, 51 h, 51 j are provided on the other end side in the axial direction of the stator core 31 and on the side not facing the hydro unit 11 (lower side in FIG. 1). As shown in FIG. 2, those jumper wires are provided by being guided by a guide portion (not shown) provided on the insulator 32 and a guide member (not shown) fixed to the stator core 31. The jumper wire 41 j connecting the W+phase winding 41 e and the W−phase winding 41 f and the jumper wire 51 j connecting the Z+phase winding 51 e and the Z−phase winding 51 f are routed outward in the radial direction with respect to the other jumper wires 41 g, 41 h, 51 g, 51 h, and thus are longer than the other jumper wires 41 g, 41 h, 51 g, 51 h.

The first three-phase winding 40 of the present embodiment is connected to the first inverter circuit 12 a by a delta connection. The second three-phase winding 50 is connected to the second inverter circuit 12 b by a delta connection.

More specifically, a terminal line 33 a of the U+phase winding 41 a is connected to an U terminal of the first inverter circuit 12 a together with a terminal line 33 a of the W−phase winding 41 f. A terminal line 33 a of the U−phase winding 41 b is connected to a V terminal of the first inverter circuit 12 a together with a terminal line 33 a of the V+phase winding 41 c. A terminal line 33 a of the W+phase winding 41 e is connected to a W terminal of the first inverter circuit 12 a together with a terminal line 33 a of the V−phase winding 41 d.

A terminal line 33 a of the X+phase winding 51 a is connected to a X terminal of the second inverter circuit 12 b together with a terminal line 33 a of the Z−phase winding 51 f. A terminal line 33 a of the X−phase winding 51 b is connected to a Y terminal of the second inverter circuit 12 b together with a terminal line 33 a of the Y+phase winding 51 c. A terminal line 33 a of the Z+phase winding 51 e is connected to a Z terminal of the second inverter circuit 12 b together with a terminal line 33 a of the Y−phase winding 51 d. In addition, the jumper wires 41 g, 41 h, 41 j, 51 g, 51 h, 51 j connect the ends of the coil 33 on the opposite side to the above terminal line 33 a for each phase.

As shown in FIG. 1, in the stator 30, a guide member 60 is provided on the side of the hydro unit 11, which is one side in the axial direction of the stator core 31.

The guide member 60 guides the terminal lines 33 a of the coils 33 in the circumferential direction at a position overlapping the coils 33 in the axial direction, and further guides them to the EDU 12. The guide member 60 includes a guide body 61 and a pullout guide 81 for pulling out.

As shown in FIGS. 5 and 6, the guide body 61 has a lower step portion 62 as a plurality of step portions, a middle step portion 63, and an upper step portion 64 so as to form a three-step shape.

The lower step portion 62 includes a bottom part 62 a that extends in the radial direction and faces in the axial direction, and a step part 62 b that extends in the axial direction from a radially inner side of the bottom part 62 a and faces in the radial direction.

The middle step portion 63 includes a bottom part 63 a which extends in the radial direction and faces in the axial direction, and a step part 63 b which extends in the axial direction from a radially inner side of the bottom part 63 a and faces in the radial direction. The bottom part 63 a extends radially inward from a tip in the axial direction of the step part 62 b.

The upper step portion 64 includes a bottom part 64 a which extends in the radial direction and faces in the axial direction, and a step part 64 b which is a wall surface extending in the axial direction from a radially inner side of the bottom part 64 a and facing in the radial direction. The bottom part 64 a extends radially inward from an end in the axial direction of the step part 63 b.

The lower step portion 62 is located closer to the stator core 31 than the middle step portion 63 and the upper step portion 64 in the axial direction in a state where the guide body 61 is attached to one side of the stator core 31 in the axial direction. The middle step portion 63 is located between the lower step portion 62 and the upper step portion 64. The upper step portion 64 is located closer on the side opposite to the stator core 31 with respect to the lower step portion 62 and the middle step portion 63 in the axial direction in a state where the guide body 61 is attached to one side in the axial direction of the stator core 31. The lower step portion 62 is located on the radially outer side with respect to the middle step portion 63 and the upper step portion 64. The upper step portion 64 is located radially inward with respect to the lower step portion 62 and the middle step portion 63. That is, the guide body 61 of the present embodiment is spaced apart from the stator core 31 in the axial direction in order from the lower step portion 62 on the radially outer side, and the outer diameter of the guide body 61 becomes smaller (that is, the diameter is decreased). In other words, the guide body 61 has the lower step portion 62, the middle step portion 63, and the upper step portion 64 so as to reduce the diameter in the axial direction toward the side opposite to the stator core 31.

The guide body 61 includes a plurality of notches 65 penetrating in the axial direction so that the terminal lines 33 a of the coil 33 penetrates from the outer side in the radial direction to the inner side in the radial direction. In other words, the guide body 61 has a notch 65. When a distal end of the terminal line 33 a which is drawn radially outward at the other axial end side of the guide body 61 is moved to one side in the axial direction, the terminal line 33 a passes through the guide body 61, and is guided so as to be led out to one side in the axial direction of the guide body 61 by the notch 65. The notch 65 includes a first notch 66 and a second notch 67. In the present embodiment, the guide body 61 includes two first notches 66 and six second notches 67.

As shown in FIG. 7, the first notch 66 is configured to draw in two terminal lines 33 a of the coil 33. The second notch 67 is configured to draw in one terminal line 33 a of the coil 33.

As shown in FIG.7 and FIG.11, each first notch 66 has a guide part 66 a and first and second holding parts 66 b, 66 c. The guide part 66 a has a shape that is cut out so as to extend radially inward from the outer end in the radial direction of the guide body 61. The first and second holding parts 66 b, 66 c have a shape that is cut out so as to extend in the circumferential direction while communicating with the guide part 66 a, and hold the terminal line 33 a of the coil 33.

The guide part 66 a, which corresponds to a radial cutout part, has a shape that is expanded toward the radially outer side at the bottom part 62 a of the lower step portion 62. Thereby, it is easy to guide the terminal line 33 a of the coil 33. Moreover, the guide part 66 a has the inclination guide part 66 e that is inclined toward the circumferential direction other side while being extending to radially inner side from radially outer side.

The first holding part 66 b, which corresponds to a circumferential cutout part, communicates with the guide part 66 a on the radially inner side of the guide part 66 a and extends to one side in the circumferential direction. The second holding part 66 c communicates with the guide part 66 a on the radially inner side of the guide part 66 a and is cut out so as to extend to the other side in the circumferential direction. That is, the first holding part 66 b and the second holding part 66 c are cut out so as to extend in opposite directions in the circumferential direction.

In addition, the guide body 61 has a circumferential projection part 66 d formed between the inclination guide part 66 e and the first holding part 66 b and extending in the circumferential direction. The circumferential projection part 66 d suppresses the interference with the terminal line 33 a wired in the first holding part 66 b by mistake, when the terminal line 33 a arranged in the second holding part 66 c is pulled in.

Further, as shown in FIG. 11, the first notch 66 is provided in a position that is routed in the circumferential direction so that the terminal lines 33 a of the coils 33 adjacent in the circumferential direction intersect.

Specifically, the coil 33 at a position corresponding to the first notch 66 includes a first coil 33 c and a second coil 33 d adjacent to one side in the circumferential direction. In the present embodiment, the V−phase winding 41 d and the U−phase winding 41 b correspond to the first coil 33 c, and the Y−phase winding 51 d and the X−phase winding 51 b correspond to the second coil 33 d.

The terminal line 33 a of the first coil 33 c includes a first axial extension part 33 e led out from the first coil 33 c to one side in the axial direction of the guide member 60, and a first routing part 33 f routed from a tip end part of the first axial extension part 33 e to one side in the circumferential direction by the guide member 60.

The terminal line 33 a of the second coil 33 d includes a second axial extension part 33 g led out from the second coil 33 d to one side in the axial direction of the guide member 60, and a second routing part 33 h routed from the tip end part of the second axial extension part 33 g to the other side in the circumferential direction by the guide member 60.

A position X1, which is a base end of the first axial extension part 33 e, and a position X2, which is a base end of the second axial extension part 33 g, are set to the positions where are different in the radial direction. Specifically, the position X1, which is a base end of the first axial extension part 33 e, is a position which corresponds to the inner end part in the radial direction of the first coil 33 c and a position overlapping the first holding part 66 b in the axial direction. That is, the position X1 is set to be located directly below the first holding part 66 b. A position X2, which is a base end of the second axial extension part 33 g is a position which corresponds to the outer end part in the radial direction of the second coil 33 d. The first axial extension part 33 e extends substantially straight in the axial direction so as to be disposed in the first holding part 66 b, and is led out to the one end side in the axial direction of the guide member 60. Further, the second axial extension part 33 g extends along the inclination guide part 66 e and extends obliquely in the axial direction so as to be disposed in the second holding part 66 c, and is led out to one side in the axial direction of the guide member 60.

As shown in FIG. 6, the second notch 67 has a guide part 67 a and a holding part 67 b. The guide part 67 a has a shape that is cut out so as to extend radially inward from the outer end in the radial direction of the guide body 61, and the holding part 67 b has a shape that is cut out so as to extend in the circumferential direction while communicating with the guide part 67 a, and holds the terminal line 33 a of the coil 33.

The guide part 67 a, which corresponds to a radial cutout part, extends toward the radially outer side at the bottom part 62 a of the lower step portion 62, similar to the first notch 66. Thereby, it is easy to guide the terminal line 33 a of the coil 33.

The holding part 67 b, which corresponds to a circumferential cutout part, communicates with the guide part 67 a on the radially inner side of the guide part 67 a and extends to one side in the circumferential direction or the other side in the circumferential direction.

Further, as shown in FIG. 22, the first holding part 66 b and the second holding part 66 c of the first notch 66 and the holding part 67 b of the second notch 67 have recessed parts 66 f, 67 c respectively. Specifically, end surfaces in the circumferential direction of the first holding part 66 b, the second holding part 66 c, and the holding part 67 b and one end surfaces (that is, the bottom parts 62 a, 63 a, 64 a) in the axial direction of the guide member 60 along the direction in which the terminal lines 33 a led to one side in the axial direction of the guide member 60 are drawn in the circumferential direction are connected by the recessed parts 66 f, 67 c having a recessed shape. The recessed parts 66 f, 67 c have curved surfaces 66 g, 67 d that are curved from the end surfaces in the circumferential direction of the first holding part 66 b, the second holding part 66 c, and the holding part 67 b. The curved surfaces 66 g, 67 d have an R shape with a radius R1 that is equal to or larger than the wire diameter (in other words, a diameter) of the terminal line 33 a. The terminal lines 33 a are led out to one end side in the axial direction of the guide member 60, and at least part of the terminal lines 33 a enter into the recessed parts 66 f, 67 c and are bent along the curved surfaces 66 g, 67 d, along the bottom parts 62 a, 63 a, 64 a. The terminal lines 33 a are routed in the circumferential direction along the bottom parts 62 a, 63 a, 64 a. In FIG. 22, one of the recessed parts 66 f, 67 c is schematically shown. However, in the present embodiment, a length in the circumferential direction of the recessed parts 66 f, 67 c is changed depends on the position where the recessed parts 66 f, 67 c are formed.

Further, partition parts 68 extending in the axial direction are provided at a location around the first notch 66 where the terminal lines 33 a having different phases easily interfere with each other at the same step portions 62, 63, 64. In the present example, at the middle step portion 63 and the upper step portion 64, the partition parts 68 extend in the axial direction on the outer side in the radial direction of the first holding part 66 b and the second holding part 66 c. The partition parts 68 are disposed radially outward from the step parts 63 b, 64 b so that the partition parts 68 are spaced apart from the respective step parts 63 b, 64 b by a gap corresponding to the diameter of the terminal line 33 a. The terminal line 33 a passing through the radially inner side from the partition parts 68 is firstly inserted into the gap and is drawn. Thereafter, the other terminal line 33 a is routed radially outward (outside) from the partition parts 68.

As shown in FIG. 5, in the middle step portion 63 and the upper step portion 64 having the first and second holding parts 66 b, 66 c of the first notch 66, chamfered parts 63 d, 64 d are formed at the top parts of the step parts 63 b, 64 b, as well as at the corner parts 63 c, 64 c located on the inner side in the radial direction of the first notch 66. Here, when the terminal line 33 a is drawn along the first notch 66, a tension may be applied toward the inner side in the radial direction. In this case, if the corner parts 63 c, 64 c are, for example, a right angle, the terminal line 33 a is bent starting from the corner parts. Therefore, the terminal line 33 a is easily separated in the radial direction from the step parts 63 b, 64 b. When the terminal line 33 a is drawn along the circumferential direction in a state where the terminal line 33 a is radially spaced from the step parts 63 b, 64 b, for example, the terminal line 33 a may not be accommodated in the first holding part 66 b. Therefore, as described above, by providing the chamfered parts 63 d, 64 d at the corner parts 63 c, 64 c as described above, the bending of the terminal line 33 a starting from the corner parts 63 c, 64 c is suppressed so that the terminal line 33 a can be suppressed from being separated from the step parts 63 b, 64 b in the radial direction. Therefore, when the terminal line 33 a is drawn along the circumferential direction, for example, the terminal line 33 a is easily accommodated in the first holding part 66 b.

As shown in FIGS. 6, 12, and 13, the guide body 61 is provided with a plurality of terminal line restricting portions 69 that extend in the radial direction from the step parts 62 b, 63 b, 64 b. Five or six terminal line restricting portions 69 of this example are provided in each of the step parts 62 b, 63 b, 64 b. Each terminal line restricting portion 69 has an extending part 69 a extending in the radial direction from each step part 62 b, 63 b, 64 b, and a protrusion 69 b extending in the axial direction from the distal end side of the extending part 69 a. An axial distance L1 from the axial distal end of the protrusion 69 b to the bottom parts 62 a, 63 a, 64 a of the step portions 62, 63, 64 is smaller than the wire diameter of the terminal line 33 a, so that the terminal line 33 a is suppressed from being shifted in the radial direction.

The extending part 69 a restricts the terminal line 33 a of the coil 33 drawn to the bottom parts 62 a, 63 a, 64 a from moving in the axial direction. In addition, the extending part 69 a of the present embodiment has a length in the radial direction that is twice or more the wire diameter of the terminal line 33 a so that movement in the axial direction of the two terminal lines 33 a arranged in the radial direction can be restricted. The protrusion 69 b restricts the terminal line 33 a of the coil 33 drawn on the bottom parts 62 a, 63 a, 64 a from moving outward in the radial direction. Thus, the vibration of the terminal line 33 a can be suppressed by restricting the movement in the radial direction and in the axial direction of the terminal line 33 a. Further, by restricting the movement in the radial direction of the terminal line 33 a, the wiring action of the terminal line 33 a is facilitated when another terminal line is drawn. That is, it becomes possible to perform wiring easily.

Here, portions of the bottom parts 62 a, 63 a, 64 a opposed to the terminal line restricting portion 69 in the axial direction are cut away, and is defined as a cutaway portions 70. As a result, the terminal line 33 a can be temporarily bent toward the cutaway portion 70, so that the clearance between the terminal line restricting portion 69 and the terminal line 33 a can be narrowed, for example. The terminal line 33 a can be stably held between the bottom parts 62 a, 63 a, 64 a around the cutaway portion 70 and the terminal line restricting portion 69.

As shown in FIGS. 5, 6, and 24, the guide body 61 is provided with an upper terminal line restricting portion 91, and the upper terminal line restricting portion 91 extends radially outward from a top part on the step part 64 b of the upper step portion 64. The upper terminal line restricting portion 91 is provided in a region where the radial length of the bottom part 64 a in the upper step portion 64 is smaller, and is provided at a circumferential position that coincides with a circumferential position where the first and second holding parts 66 b, 66 c of the first notch 66 in the middle step portion 63.

Further, the push-up guide portions 92 are provided at a position shifted in the circumferential direction from the upper terminal line restricting portion 91, and provided on the bottom part 64 a on both sides in the circumferential direction of the upper terminal line restricting portion 91, and the axial height of the push-up guide positions 92 gradually increases toward the step part 64 b. Thereby, when the terminal line 33 a is wired so as to be wound along the step part 64 b, the terminal line 33 a is lifted in the axial direction from the bottom part 64 a by the action of the push-up guide portion 92. Then, the two terminal lines 33 a drawn in the circumferential direction on the bottom part 64 a of the upper step portion 64 are arranged to shift in the axial direction and the radial direction at the circumferential position corresponding to the upper terminal line restricting portion 91 and the push-up guide portion 92.

As shown in FIGS. 24, 25, a protrusion 91 a protruding toward the bottom part 64 a is provided on the radially outer side of the upper terminal line restricting portion 91. A height of the protrusion 91 a is set to be 0.5 times or more the wire diameter of the terminal line 33 a, and an axial distance L2 from the tip of the protrusion 91 a to the bottom part 64 a is set to be smaller than 1.5 times of the wire diameter of the terminal line 33 a.

Here, portion of the bottom part 64 a opposed to the upper terminal line restricting portion 91 in the axial direction are cut away, and is defined as a cutaway portion 93.

As shown in FIGS. 3 to 5, the guide member 60 is provided with a plurality of attachment pieces 71 that extend downward from the lower surface of the bottom part 62 a of the lower step portion 62 and are attached to the insulator 32 of the stator core 31.

As shown in FIG. 23, the attachment piece 71 and the insulator 32 are engaged in the axial direction by a so-called snap-fit structure. In other words, the attachment piece 71 restricts the guide member 60 from moving in the axial direction away from the stator core 31, since a claw of the attachment piece 71 is engaged with the insulator 32. As a result, the guide member 60 is prevented from falling off the stator core 31 (specifically, the insulator 32).

As shown in FIGS. 3 to 5, the guide member 60 has a plurality of leg portions 72. The plurality of leg portions 72 extend downward from a bottom surface of the bottom part 62 a of the lower step portion 62, and are capable of contacting the stator core 31 in the axial direction in a state where the guide member 60 is attached to the stator core 31 (specifically, the insulator 32). The leg portions 72 are provided at a position separated from the attachment piece 71 in the circumferential direction.

Specifically, as shown in FIG. 23, the leg portion 72 includes an axial contact part 72 a that can axially contact one axial end surface of the stator core 31, and a circumferential contact part 72 b that contacts the groove 31 c in the circumferential direction. The groove 31 c further protrudes in the axial direction adjacent to the axial contact part 72 a and is provided on the outer peripheral surface of the stator core 31. The circumferential contact part 72 b of the present embodiment protrudes in the axial direction from the center in the circumferential direction of the axial contact part 72 a. In other words, it protrudes in the axial direction from between the pair of axial contact parts 72 a provided in the circumferential direction. Further, the axial contact part 72 a is set so as to contact the one axial end surface of the stator core 31 in a state where the tip of the attachment piece 71 are not in contact with the axial one end surface of the stator core 31. The attachment piece 71 engages with the insulator 32 so as to allow the guide member 60 to move slightly away from the stator core 31 in the axial direction in a state where the axial contact part 72 a is in contact with one axial end surface of the stator core 31. That is, the guide member 60 is assembled to the stator core 31 so as to be movable in a slight fixed range in the axial direction. In other words, the guide member 60 and the stator core 31 are assembled so as to be relatively movable within a certain range in the axial direction, that is, assembled with a slight backlash. The guide member 60 is restrained from moving in the axial direction by the terminal line 33 a wired in a state assembled to the stator core 31 mainly contacting the curved surfaces 66 g, 67 d, therefore shaking with respect to the stator core 31 is suppressed. That is, when the terminal line 33 a led to one axial direction of the guide member 60 is drawn in the circumferential direction, the terminal line 33 a mainly pushes the curved surfaces 66 g, 67 d, so that the guide member 60 is pressed toward the stator core 31, and the axial contact part 72 a is in contact with the stator core 31. Further, shaking of the guide member 60 with respect to the stator core 31 is suppressed by the terminal line 33 a which is plastically deformed mainly along the curved surfaces 66 g, 67 d.

As shown in FIGS. 3 and 9, the guide member 60 has a convex restricting portion 73 extending toward the stator core 31 in the axial direction. The restricting portion 73 extends from the lower surface of the bottom part 62 a of the lower step portion 62 to the stator core 31 side. As shown in FIG. 9, when the guide member 60 is attached to the stator core 31, the restricting portion 73, the insulator 32, and the coil 33 surround the periphery of the axially extending part 33 b in the terminal line 33 a of the coil 33. This restricts the movement of the axially extending part 33 b. A front end in the axial direction of the restricting portion 73 is disposed between the coils 33 adjacent in the circumferential direction and has a tapered shape along the inclination of the coil end.

As shown in FIG. 8, when the drawing direction in the circumferential direction of the terminal line 33 a of the coil 33 is a direction in which the winding of the coil 33 around the stator core 31 is loosened, the holding part 67 b, which is a circumferential end portion on the radially inner side of the second notch 67, is provided on the axially extending part 33 b. Thereby, even when the terminal line 33 a is drawn in the circumferential direction, the winding of the coil 33 is suppressed from being loosened.

As shown in FIGS. 6, 10, and 14, the guide body 61 includes a collecting portion 74 that collects the terminal lines 33 a at one place in the circumferential direction. The collecting portion 74 collects the coils 33 of different systems at one place in the circumferential direction, namely collects all the terminal lines 33 a of the first three-phase winding 40 of one system connected to the first inverter circuit 12 a and all terminal lines 33 a of the second three-phase winding 50 of the other system connected to the second inverter circuit 12 b at one place in the circumferential direction.

Further, as shown in FIG. 14, the collecting portion 74 includes a first collecting part 74 a that collects the terminal lines 33 a of one system, and a second collecting part 74 b that collects a terminal line 33 a of the other system adjacent to the first collecting part 74 a in the circumferential direction.

The first collecting part 74 a and the second collecting part 74 b are provided on each of the step portions 62, 63, 64 and are located in a line with the radial direction. The collecting portion 74 includes loose fitting portion 75 that holds the terminal lines 33 a drawn on the step portions 62, 63, 64 as a collecting holding part. That is, two loose fitting portions 75 are provided in each of the step portions 62, 63, 64. Six loose fitting portions 75 are provided in total. The loose fitting portions 75 extend radially outward from the step parts 62 b, 63 b, 64 b of the step portions 62, 63, 64. The loose fitting portions 75 include introduction parts 75 b that penetrate in the axial direction and open radially outward, and lead-out holding parts 75 a that communicate with the introduction part 75 b and hold the terminal line 33 a while being led out to one side in the axial direction.

The lead-out holding part 75 a has a shape that has an opening area larger than the wire diameter of the terminal line 33 a and opens in the axial direction. In one example, the lead-out holding part 75 a has an open width that is more than two times greater than the diameter of the terminal line 33 a. In one example, the lead-out holding part 75 a has an open area that is more than two times greater than a cross-sectional area of the terminal line 33 a. The introduction parts 75 b are located at a radially outer side of the lead-out holding part 75 a, and have an opening that is smaller than the wire diameter of the terminal line 33 a and open in the radial direction. The terminal line 33 a can be introduced into the lead-out holding part 75 a from the radially outer side by the introduction part 75 b. Further, two terminal lines 33 a in the lead-out holding part 75 a are in a loose fitting state even if two terminal lines 33 a are introduced in the loose fitting portions 75. Thereby, since excessive tension is not applied to the terminal line 33 a, damage to the terminal line 33 a is suppressed.

As shown in FIG. 15, a cutaway portion 76 is formed on the bottom part which is opposite to the loose fitting portion 75 in the axial direction. As a result, when the terminal line 33 a is pulled out and raised in the axial direction, the terminal line 33 a is allowed to bend toward the cutaway portion 76. Thus, the terminal line 33 a is upwardly drawn from the loose fitting portion 75 along the axial direction.

Here, the terminal lines 33 a drawn on the bottom part 62 a of the lower step portion 62 are connected to the U terminal of the first inverter circuit 12 a and the X terminal of the second inverter circuit 12 b. Further, the terminal lines 33 a drawn on the bottom part 63 a of the middle step portion 63 are connected to the V terminal of the first inverter circuit 12 a and the Y terminal of the second inverter circuit 12 b. Further, the terminal lines 33 a drawn on the bottom part 64 a of the upper step portion 64 are connected to the W terminal of the first inverter circuit 12 a and the Z terminal of the second inverter circuit 12 b.

Then, the terminal line 33 a of one system is drawn in a circumferential direction that does not pass through the second collecting part 74 b (in a counterclockwise direction in FIGS. 2 and 10) and is collected in the first collecting part 74 a. The terminal line 33 a of the other system is drawn in the circumferential direction that does not pass through the first collecting part 74 a (in a clockwise direction in FIGS. 2 and 10) and is collected in the second collecting part 74 b.

Further, the terminal line 33 a of the coil 33 arranged in the vicinity of the collecting portion 74 in the terminal line 33 a is a non-drawn terminal wire 33 j that is collected in the collecting portion 74 without being drawn on the guide member 60 in the circumferential direction. In the present embodiment, the terminal line 33 a of the W−phase winding 41 f and the Z−phase winding 51 f of the coil 33 arranged closest to the collecting portion 74 is a non-drawn terminal wire 33 j. As described above, the W−phase winding 41 f and the Z−phase winding 51 f are the coils 33 connected by the jumper wires 41 j, 51 j longer than the other jumper wires 41 g, 41 h, 51 g, 51 h, respectively. Further, the non-drawn terminal wire 33 j is held on the radially outer side of the loose fitting portion 75. Further, a center in the circumferential direction of the first collecting part 74 a and the second collecting part 74 b is coincide with a center in the circumferential direction of the W−phase winding 41 f and the Z−phase winding 51 f. The pair of non-drawn terminal wires 33 j are respectively held on the side close to the circumferential direction in the loose fitting portion 75. The non-drawn terminal wire 33 j is not routed in the circumferential direction on one end side in the axial direction of the guide member 60, and extends to the loose fitting portion 75 on the radially outer side on the other axial end side of the guide member 60 so as to be led out from the loose fitting portion 75 to one side in the axial direction and be held.

As shown in FIGS. 16A to 16D and FIG. 17, the pullout guide 81 is configured to have a long column shape in the axial direction. The pullout guide 81 has six through holes 82 respectively corresponding to the six loose fitting portions 75 when the pullout guide 81 is attached to the guide body 61.

Each through hole 82 is configured to be opposite to the respective loose fitting portion 75 in the axial direction, when the pullout guide 81 is attached to the guide body 61. Each through hole 82 is formed along a longitudinal direction (that is, the axial direction) of the pullout guide 81.

The pullout guide 81 is made of, for example, an insulating material such as a resin. Therefore, the terminal line 33 a inserted into the through hole 82 of the pullout guide 81 is insulated from the other terminal line 33 a inserted into the other through hole 82. Further, the housing 11 a of the hydro unit 11 and the terminal line 33 a inserted through each through hole 82 are insulated.

As shown in FIGS. 16A to 16D and FIG. 17, in each through hole 82, an opening area of an inlet port 82 a located on the stator core 31 side is larger than an opening area of an outlet port 82 b located on the side opposite to the stator core 31. Each through hole 82 has an opening area that gradually decreases from the inlet port 82 a side to the outlet port 82 b side. An inner peripheral surface of the through hole 82 has a curved surface shape.

As shown in FIG. 16A, the through holes 82 have a substantially quadrangular opening shape at positions close to the inlet port 82 a. As shown in FIG. 16D, the through hole 82 has an oval shape at positions close to the outlet port 82 b. As shown in FIG. 16B, the opening shape of the through hole 82 is a constant-width triangular shape at a midway position between the inlet port 82 a and the outlet port 82 b. Such a structure allows the through hole 82 to guide the terminal line 33 a so that the plurality terminal lines 33 a inserted in the through hole 82 are arranged in a predetermined direction. Further, in a configuration having a constant-width triangular shape (so-called Reuleaux triangular shape) in the intermediate position of the through hole 82, for example, when the width of the triangular shape may corresponds to two of the wire diameter of the terminal line 33 a, the two terminal lines 33 a may be moved at that position, and the position of the terminal line 33 a may be adjusted.

Further, since the opening area of the through hole 82 at positions close to the inlet port 82 a is sufficiently larger than the wire width of each terminal line 33 a, each terminal line 33 a is in a non-fixed state. Here, the resonance frequency decreases as the non-fixed length of the terminal line 33 a increases. The resonance frequency may be increased, when the through holes 82 have a constant cross-sectional area in a predetermined range from the outlet port 82 b.

Next, a method for manufacturing the stator of the present embodiment will be described.

As shown in FIG. 18, the coils 33 are wound around the teeth 31 b of the stator core 31.

Next, as shown in FIG. 18, a bending step is performed in which the terminal lines 33 a of the coil 33 wound around the teeth 31 b of the stator core 31 are pulled out in the axial direction and bent in the radial direction.

Next, as shown in FIG. 19, an assembling step is performed in which the guide body 61 of the guide member 60 is assembled on the one end side in the axial direction of the stator core 31. At this time, since each terminal line 33 a is bent in the radial direction in the bending step, interference of the guide member 60 with the terminal line 33 a is suppressed.

Next, as shown in FIG. 20, the terminal lines 33 a are bent in the axial direction, and a drawing process is performed in which the terminal lines 33 a are drawn in the corresponding first and second notches 66 and 67.

Next, as shown in FIG. 21, a wiring step is performed in which the terminal lines 33 a are drawn in the circumferential direction, and thereafter a pulling-out step is performed in which the terminal line 33 a is drawn toward one side in the axial direction while holding the terminal lines 33 a in the loose fitting portion 75. The drawing-in step, the wiring step, and the pulling-out step are repeatedly performed for each of the terminal lines 33 a. In the present example, the wiring step is repeatedly performed on the terminal lines 33 a in order from the one that is wired on the radially inner side (upper step portion 64 side). For the non-drawn terminal wire 33 j, only the pulling-out step is performed without performing the drawing-in step and the wiring step.

Thereafter, the pullout guide 81 is passed through the through hole 11 b provided in the housing 11 a of the hydro unit 11 in a state where the terminal lines 33 a held in each loose fitting portion 75 are inserted in the through hole 82 of the pullout guide 81. Furthermore, the terminal lines 33 a are electrically connected to the first inverter circuit 12 a or the second inverter circuit 12 b provided on the circuit board in the EDU 12.

The effects of the present embodiment will be described.

(1) The guide member 60 is disposed on one side in the axial direction of the stator core 31, and guides the terminal lines 33 a of the coil 33 in the circumferential direction at a position overlapping the coil 33 in the axial direction. Therefore, the increase in the radial direction may be easily suppressed as compared with the configuration where the terminal lines 33 a of the coil 33 are drawn outside in the radial direction of the coil 33. Further, the guide member 60 includes the notches 65 (specifically, the first notches 66 and the second notches 67) penetrating in the axial direction so that the terminal lines 33 a are guided so as to be led out to one side in the axial direction of the guide body 61. The notches 65 have the guide parts 66 a, 67 a which extend from the outer side in the radial direction of the guide member 60 to the inner side in the radial direction of the guide member 60. Therefore, the terminal lines 33 a may be easily led out to one end side in the axial direction of the guide member 60. The end surfaces in the circumferential direction at the inner end in the radial direction of the notch 65, and the one end surface (that is, bottom parts 62 a, 63 a, 64 a) in the axial direction of the guide member 60 along the direction in which the terminal line 33 a led to one side in the axial direction of the guide member 60 is drawn in the circumferential direction are connected by the recessed parts 66 f, 67 c having a recessed shape. Therefore, for example, as compared with the case where the recessed parts 66 f, 67 c are not formed and are connected at a right angle, the bulge in the axial direction at the portion where the terminal lines 33 a are bent may be suppressed. That is, in the case where the recessed parts 66 f, 67 c are not formed and are connected at right angles, it is necessary to bend the terminal lines 33 a with a tension that does not damage the terminal lines 33 a. Therefore, the terminal lines 33 a are in a state of being floated from one end surface in the axial direction of the guide member 60, and bulges in the axial direction. On the other hand, in the present embodiment, this bulge may be suppressed. As a result, for example, it is possible to reduce the axial size and improve the workability when the other terminal lines 33 a are drawn.

(2) Since the recessed parts 66 f, 67 c have curved surfaces 66 g, 67 d that are curved from the circumferential end surface at the radially inner end of the notch 65, the terminal lines 33 a are suppressed from being damaged.

(3) Since the curved surfaces 66 g and 67 d have an R shape with a radius R1 equal to or larger than the wire diameter of the terminal lines 33 a, the terminal lines 33 a are further suppressed from being damaged. The above matter is an effect based on experimental results. When the curved surfaces 66 g, 67 d have an R shape with a radius less than the wire diameter of the terminal lines 33 a, the rate of damage to the coating is high, and when the curved surfaces 66 g, 67 d have an R shape with a radius R1 equal to or larger than the wire diameter of the terminal lines 33 a, the rate of damage to the coating is low.

(4) The guide member 60 has an axial contact part 72 a that can contact the stator core 31 in the axial direction, and is assembled to the stator core 31 so as to be movable within a certain range in the axial direction. Since the guide member 60 is restrained from moving in the axial direction due to the contact of the terminal line 33 a with the curved surfaces 66 g, 67 d, the shaking of the guide member 60 in the axial direction with respect to the stator core 31 may be suppressed without using another member.

(5) The guide member 60 includes the circumferential contact part 72 b that protrudes in the axial direction adjacent to the axial contact part 72 a and contacts the groove 31 c provided in the stator core 31 in the circumferential direction. Therefore, the guide member 60 may be positioned in the axial direction and the circumferential direction with high accuracy by the axial contact part 72 a and the circumferential contact part 72 b adjacent to each other.

(6) The guide member 60 includes an attachment piece 71 having a snap-fit structure that restricts movement in a direction away in the axial direction from the stator core 31 at a position away from the axial contact part 72 a. Therefore, the guide member 60 may be easily assembled to the stator core 31. In the attachment piece 71 with the snap-fit structure, it is difficult to be assembled the stator core 31 without rattling in the axial direction. However, the axial movement is suppressed by the contact of the terminal lines 33 a with the curved surfaces 66 g, 67 d.

The above-described embodiments may be modified as follows. The above-described embodiments and the following modifications can be implemented in combination with one another as long as there is no technical contradiction.

In the above embodiment, the push-up guide portion 92 has a shape in which the axial height gradually increases at a constant rate toward the step part 64 b. However, it is only necessary that the terminal line 33 a is wound along the step part 64 b and the terminal lines 33 a are lifted from the bottom part 64 a in the axial direction.

For example, as shown in FIG. 25, the push-up curved surface part 92 a that makes surface contact with the outer periphery of the terminal lines 33 a may be formed on a top part of the push-up guide portion 92. According to the above configuration, the terminal line 33 a surface-contacts with the push-up curved surface part 92 a, and the shakiness of the terminal line 33 a may be eliminated and the terminal line 33 a may be held stably.

In the example shown in FIG. 25, the upper terminal line restricting portion 91 has an upper curved surface part 91 b that is in surface contact with the outer periphery of the terminal line 33 a. According to the above configuration, the terminal line 33 a surface-contacts with the upper curved surface part 91 b, and the shakiness of the terminal line 33 a may be eliminated and terminal line 33 a may be held stably.

In the above embodiment, the recessed parts 66 f, 67 c have the curved surfaces 66 g, 67 d that are curved from the circumferential end surface at the radially inner end of the notch 65. However, the present embodiment is not limited to this configuration. The recessed parts 66 f, 67 c without having the curved surfaces 66 g, 67 d may be available.

In the above embodiment, the curved surfaces 66 g, 67 d have an R shape with the radius R1 equal to or larger than the wire diameter of the terminal line 33 a. However, the present embodiment is not limited to this configuration. The curved surfaces 66 g, 67 d may have an R shape with the radius less than the wire diameter of the terminal line 33 a.

In the above embodiment, the guide member 60 is prevented from moving in the axial direction by the contact of the terminal line 33 a with the curved surfaces 66 g, 67 d. However, the guide member 60 is not limited to this configuration. The shakiness of the axial direction of the guide member 60 with respect to the stator core 31 may be suppressed by using another structure or another member, for example.

In the above embodiment, the guide member 60 includes the circumferential contact part 72 b that protrudes in the axial direction adjacent to the axial contact part 72 a and contacts the groove 31 c provided in the stator core 31 in the circumferential direction. However, the guide member is not limited to this configuration. The guide member may be positioned in the circumferential direction with another configuration without having the circumferential contact part 72 b.

In the above embodiment, the guide member 60 includes the attachment piece 71 having a snap-fit structure that restricts movement in a direction away in the axial direction from the stator core 31 at a position separated from the axial contact part 72 a. However, the guide member is not limited to this configuration. The guide member 60 may be assembled to the stator core 31 by using another structure.

In the above embodiment, the coil 33 has a coil 33 of a different system (specifically, the first three-phase winding 40 and the second three-phase winding 50) connected to the circuit of the different system (specifically, the first and second inverter circuits 12 a and 12 b). However, the coil is not limited to this configuration. The stator 30 may have only a coil connected to a circuit in a single system. In this configuration, of course, the collecting portion 74 collects only the terminal lines 33 a in the single system.

In the above embodiment, the collecting portion 74 includes a first collecting part 74 a that collects the terminal lines 33 a of one system, and a second collecting part 74 b that collects a terminal line 33 a of the other system adjacent to the first collecting part 74 a in the circumferential direction. However, the collecting portion is not limited to this configuration. For example, the terminal line 33 a of one system and the terminal line 33 a of the other system may be collected in the first collecting part 74 a. Further, for example, the terminal line 33 a of one system and the terminal line 33 a of the other system may be collected in the second collecting part 74 b.

In the above embodiment, the terminal line 33 a of one system is drawn in the circumferential direction that does not pass through the second collecting part 74 b and is collected in the first collecting part 74 a, and the terminal line 33 a of the other system is drawn in the circumferential direction that does not pass through the first collecting part 74 a and is collected in the second collecting part 74 b. The terminal line 33 a of one system and the terminal line 33 a of the other system are not limited to this configuration. At least one terminal line 33 a may be drawn in the reverse direction.

In the above embodiment, the first collecting part 74 a and the second collecting part 74 of the collecting portion 74 include the loose fitting portions 75 that hold the terminal lines 33 a drawn on each of the step portions as a collecting holding part. The first collecting part 74 a and the second collecting part 74 are not limited to this configuration. The collecting portion 74 may hold the terminal lines 33 a without being drawn on the step portion.

In the above embodiment, the loose fitting portion 75 as the collecting holding part includes the introduction parts 75 b that penetrate in the axial direction and open radially outward, and the lead-out holding parts 75 a that communicate with the introduction part 75 b and hold the terminal line 33 a while being led out to one side in the axial direction. The loose fitting portion 75 is not limited to this configuration. The collecting holding part with another structure may be used as long as the terminal lines 33 a can be held. For example, although the loose fitting portion 75 hold the terminal lines 33 a in a loose fitting state, the collecting holding part may hold the terminal lines 33 a in a non-loose fitting state.

The position X1, which is a base end of the first axial extension part 33 e in the terminal line 33 a of the first coil 33 c, and the position X2, which is a base end of the second axial extension part 33 g in the terminal line 33 a of the second coil 33 d, are set to the positions where are different in the radial direction. The positions X1 and X2 are not limited to this configuration. The positions X1 and X2 may be set to the positions where are same in the radial direction.

In the above embodiment, the guide part 66 a has the inclination guide part 66 e that is inclined toward the circumferential direction other side while being extending to radially inner side from radially outer side. The guide part 66 a is not limited to this configuration. The guide part 66 a may be formed so as to not to incline in the circumferential direction as a whole.

In the above embodiment, the partition parts 68 extend in the axial direction on the outer side in the radial direction of the first holding part 66 b and the second holding part 66 c. The partition parts 68 are not to this configuration. The partition parts 68 may be provided only on the radially outer side of either one of the first holding part 66 b and the second holding part 66 c, or the partition part 68 may be omitted.

In the above embodiment, the position X1, which is a base end of the first axial extension part 33 e, is a position which corresponds to the inner end part in the radial direction of the first coil 33 c, and the position X2, which is a base end of the second axial extension part 33 g is a position which corresponds to the outer end part in the radial direction of the second coil 33 d. The positions X1 and X2 are not limited to this configuration. The positions X1 and X2 may be different positions in the radial direction which correspond to the end part in the radial direction.

In the above embodiment, the terminal line 33 a of the coil 33 arranged in the vicinity of the collecting portion 74 in the terminal line 33 a is the non-drawn terminal wire 33 j that is collected in the collecting portion 74 without being drawn on the guide member 60 in the circumferential direction. The terminal line 33 a is not limited to this configuration. All terminal lines 33 a may be drawn on the guide member 60 in the circumferential direction.

In the above embodiment, the coils 33 (specifically, the W−phase winding 41 f and the Z−phase winding 51 f) provided with the non-drawn terminal wire 33 j are connected to each other by the jumper wire 41 j, 51 j which are longer than the other jumper wires 41 g, 41 h, 51 g, 51 h. The coils are connected to each other by the jumper wire having the same length.

In the above embodiment, the jumper wires 41 g, 41 h, 41 j, 51 g, 51 h, 51 j are arranged on the other axial end side opposite to the side on which the guide member 60 of the stator core 31 is arranged. The jumper wires are not limited to this configuration. The jumper wires may be are arranged on the one axial end side to the side on which the guide member 60 of the stator core 31 is arrange.

In the above embodiment, the non-drawn terminal wire 33 j is held on the radially outer side of the loose fitting portion 75. The non-drawn terminal wire 33 j is not limited to this configuration. For example, the non-drawn terminal wire 33 j may be held on the radially inner side of the loose fitting portion 75.

In the above embodiment, the center in the circumferential direction of the first collecting part 74 a and the second collecting part 74 b in the collecting portion 74 is coincide with the center in the circumferential direction of the W−phase winding 41 f and the Z−phase winding 51 f. However, the center in the circumferential direction of the first collecting part 74 a and the second collecting part 74 b may not be coincide with the center in the circumferential direction of the W−phase winding 41 f and the Z−phase winding 51 f Moreover, in the above embodiment, the terminal line 33 a of the coil 33 arranged in the vicinity of the collecting portion 74 in the terminal line 33 a is the non-drawn terminal wire 33 j. The non-drawn terminal wire 33 j is not limited to this configuration. The terminal line 33 a of the coil 33 disposed in the vicinity of the collecting portion 74 to the extend that it can be collected to the collecting portion 74 without being drawn in the circumferential direction by the guide member 60 may be the non-drawn terminal wire 33 j.

In the above embodiment, a part of the plurality of terminal lines 33 a drawn in the circumferential direction on the bottom part 64 a is shifted in the axial direction and the radial direction. However, all of the plurality of terminal lines 33 a drawn in the circumferential direction on the bottom part 64 a may be shifted not in the axial direction, but in the radial direction.

In the above embodiment, the push-up guide portion 92 is provided on the step part 64 b and has a shape in which the axial height gradually increases toward the step part 64 b. However, the push-up guide portion 92 may be omitted.

In the above embodiment, the guide member 60 has the upper terminal line restricting portion 91 which extends radially outward from a top part on the step part 64 b of the upper step part 64 b so as to restrict the movement of the terminal line 33 a in the axial direction. However, the upper terminal line restricting portion 91 may be omitted.

In the above embodiment, the protrusion 91 a protruding toward the bottom part 64 a is provided on the radially outer side of the upper terminal line restricting portion 91. However, the protrusion 91 a may be omitted. Further, the protrusion amount of the protrusion 91 a and the axial distance L2 from the tip of the protrusion 91 a to the bottom part 64 a may be changed.

In the above embodiment, the push-up guide portions 92 are provided at a position shifted in the circumferential direction from the upper terminal line restricting portion 91. However, the push-up guide portions 92 and the upper terminal line restricting portion 91 may be provided at a position that coincides in the circumferential direction, in other words, a position that overlaps with each other in the axial direction.

In the above embodiment, the guide body 61 of the guide member 60 has the lower step portion 62, the middle step portion 63, and the upper step portion 64 as a plurality of step portions to form a three-step staircase. However, for example, the guide body may have two step portions. For example, the guide body may have no step portion, namely, the structure in which each terminal line 33 a is drawn in the circumferential direction on the single plane of the guide member. In addition, in the structure without step portion, it is preferable to provide a wall part at a position where the step parts 62 b, 63 b, 64 b in the above embodiment.

In the above embodiment, the first notch 66 has the first and second holding parts 66 b, 66 c that are notched from the radially inner side of the guide part 66 a to both sides in the circumferential direction. However, any one of the first and second holding parts 66 b, 66 c may be omitted, that is, the second notch 67 may be used instead of the first notch 66, for example. When the second notch 67 is used in place of the first notch 66, the two second notches 67 are provided to the one first notch 66, so that substantially the same function is obtained.

In the above embodiment, the terminal line restricting portion 69 is provided. However, the terminal line restricting portion 69 may be omitted.

In the above embodiment, the drawing-in step, the wiring step, and the pulling-out step are repeated and carried out in order from the terminal line 33 a drawn in the radial inner side (upper step portion 64 side). However, for example, at least one of the terminal line 33 a is drawn on radially outer side, and then the terminal line 33 a is wired on radially inner side.

However, in the assumable stator, the grooves are provided on the insulator, and a portion where the grooves are formed is limited to the outer side in the radial direction than a portion around which the windings are wound. Therefore, this may increase the size in the radial direction of the stator including the insulator.

The present disclosure is made to solve the above-described problems, and it is an object of the present disclosure to provide the stator that can suppress an increase in the radial direction.

In the stator (30), coils (33) of multiple phases are wound around a stator core (31) via an insulator (32). A guide member (60) is provided on one side of the stator core in an axial direction and guides a terminal line (33 a) of the coil in a circumferential direction at a position overlapping the coil in the axial direction. The guide member has a notch (65) that includes a guide part (66 a, 67 a) extending radially inward from an outer end in the radial direction of the guide member, penetrates in the axial direction, and guides the terminal line to one side in the axial direction. End surfaces in the circumferential direction at the inner end in the radial direction of the notch, and one end surface (62 a, 63 a, 64 a) in the axial direction of the guide member along the direction in which the terminal line led to one side in the axial direction of the guide member is drawn in the circumferential direction are connected by the recessed parts (66 f, 67 c) having a recessed shape.

According to this configuration, the guide member is disposed on one side in the axial direction of the stator core, and guides the terminal lines of the coil in the circumferential direction at a position overlapping the coil in the axial direction. Therefore, the increase in the radial direction may be easily suppressed as compared with the configuration where the terminal lines of the coil are drawn outside in the radial direction of the coil. Further, the guide member includes the notch penetrating in the axial direction so that the terminal lines are guided so as to be led out to one side in the axial direction of the guide body. The notches have the guide parts which extend from the outer side in the radial direction of the guide member to the inner side in the radial direction of the guide member. Therefore, the terminal lines may be easily led out to one end side in the axial direction of the guide member. End surfaces in the circumferential direction at the inner end in the radial direction of the notch, and one end surface in the axial direction of the guide member along the direction in which the terminal line led to one side in the axial direction of the guide member is drawn in the circumferential direction are connected by the recessed parts having a recessed shape. Therefore, for example, as compared with the case where the recessed parts are not formed and are connected at a right angle, the bulge in the axial direction at the portion where the terminal lines are bent may be suppressed. That is, in the case where the recessed parts are not formed and are connected at right angles, it is necessary to bend the terminal lines with a tension that does not damage the terminal lines. Therefore, the terminal lines are in a state of being floated from one end surface in the axial direction of the guide member, and bulges in the axial direction. On the other hand, this bulge may be suppressed. As a result, for example, it is possible to reduce the axial size and improve the workability when the other terminal lines are drawn. 

The invention claimed is:
 1. A stator comprising: a stator core; coils of multiple phases that are wound around the stator core via an insulator, and include a plurality of terminal lines; and a guide member that is disposed on one side of the stator core in an axial direction, and being configured to guide the plurality of terminal lines of the coils in a circumferential direction at a position overlapping with the coils in the axial direction, wherein the guide member has a notch that includes a guide part extending radially inward from an outer end in a radial direction of the guide member, penetrates in the axial direction, and guides a terminal line to one side in the axial direction, and end surface in the circumferential direction at an inner end in the radial direction of the notch, and one end surface in the axial direction of the guide member along the direction in which the terminal line led to one side in the axial direction of the guide member is drawn in the circumferential direction, are connected by a recessed part having a recessed shape.
 2. The stator according to claim 1, wherein the recessed part has a curved surface that is curved from a circumferential end surface at a radially inner end of the notch.
 3. The stator according to claim 2, wherein the curved surface has an R shape with a radius equal to or larger than a wire diameter of the terminal line.
 4. The stator according to claim 2, wherein the guide member has an axial contact part capable of contacting the stator core in the axial direction, and is assembled to the stator core so as to be movable within a certain range with respect to the stator core so that axial movement of the guide member is suppressed by contact of the terminal line with the curved surface.
 5. The stator according to claim 4, wherein the guide member includes a circumferential contact part that protrudes in the axial direction adjacent to the axial contact part and contacts a groove provided in the stator core in the circumferential direction.
 6. The stator according to claim 4, wherein the guide member has an attachment piece with a snap fit structure which restricts the movement in a direction away in the axial direction from the stator core at a position separated from the axial contact part.
 7. The stator according to claim 3, wherein the guide member has an axial contact part capable of contacting the stator core in the axial direction, and is assembled to the stator core so as to be movable within a certain range with respect to the stator core so that axial movement of the guide member is suppressed by contact of the terminal line with the curved surface. 